Run linter for pr-checks in CI

Author: mbg

.github/workflows/pr-checks.yml

@@ -101,6 +101,11 @@ jobs:
         working-directory: pr-checks
         run: npm ci && npx tsx --test
 
+      - name: Lint
+        if: always()
+        working-directory: pr-checks
+        run: npm run lint
+
   check-node-version:
     if: github.triggering_actor != 'dependabot[bot]'
     name: Check Action Node versions